<template>
    <view class="uni-swiper__warp">
        <slot />
        <view
            v-if="mode === 'default'"
            key="default"
            :style="{ bottom: dots.bottom + 'px' }"
            class="uni-swiper__dots-box"
        >
            <view
                v-for="(item, index) in info"
                :key="index"
                :style="{
                    width: (index === current ? dots.width * 2 : dots.width) + 'px',
                    height: dots.width / 2 + 'px',
                    'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor,
                    'border-radius': '0px'
                }"
                class="uni-swiper__dots-item uni-swiper__dots-bar"
                @click="clickItem(index)"
            />
        </view>
        <view v-if="mode === 'dot'" key="dot" :style="{ bottom: dots.bottom + 'px' }" class="uni-swiper__dots-box">
            <view
                v-for="(item, index) in info"
                :key="index"
                :style="{
                    width: dots.width + 'px',
                    height: dots.height + 'px',
                    'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor,
                    border: index !== current ? dots.border : dots.selectedBorder
                }"
                class="uni-swiper__dots-item"
                @click="clickItem(index)"
            />
        </view>
        <view v-if="mode === 'round'" key="round" :style="{ bottom: dots.bottom + 'px' }" class="uni-swiper__dots-box">
            <view
                v-for="(item, index) in info"
                :key="index"
                :class="[index === current && 'uni-swiper__dots-long']"
                :style="{
                    width: (index === current ? dots.width * 3 : dots.width) + 'px',
                    height: dots.height + 'px',
                    'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor,
                    border: index !== current ? dots.border : dots.selectedBorder
                }"
                class="uni-swiper__dots-item"
                @click="clickItem(index)"
            />
        </view>
        <view
            v-if="mode === 'nav'"
            key="nav"
            :style="{ 'background-color': dotsStyles.backgroundColor, bottom: '0' }"
            class="uni-swiper__dots-box uni-swiper__dots-nav"
        >
            <text :style="{ color: dotsStyles.color }" class="uni-swiper__dots-nav-item">{{
                current + 1 + "/" + info.length + " " + info[current][field]
            }}</text>
        </view>
        <view
            v-if="mode === 'indexes'"
            key="indexes"
            :style="{ bottom: dots.bottom + 'px' }"
            class="uni-swiper__dots-box"
        >
            <view
                v-for="(item, index) in info"
                :key="index"
                :style="{
                    width: dots.width + 'px',
                    height: dots.height + 'px',
                    color: index === current ? dots.selectedColor : dots.color,
                    'background-color': index !== current ? dots.backgroundColor : dots.selectedBackgroundColor,
                    border: index !== current ? dots.border : dots.selectedBorder
                }"
                class="uni-swiper__dots-item uni-swiper__dots-indexes"
                @click="clickItem(index)"
                ><text class="uni-swiper__dots-indexes-text">{{ index + 1 }}</text></view
            >
        </view>
    </view>
</template>

<script>
/**
 * SwiperDod 轮播图指示点
 * @description 自定义轮播图指示点
 * @tutorial https://ext.dcloud.net.cn/plugin?id=284
 * @property {Number} current 当前指示点索引，必须是通过 `swiper` 的 `change` 事件获取到的 `e.detail.current`
 * @property {String} mode = [default|round|nav|indexes] 指示点的类型
 * 	@value defualt 默认指示点
 * 	@value round 圆形指示点
 * 	@value nav 条形指示点
 * 	@value indexes 索引指示点
 * @property {String} field mode 为 nav 时，显示的内容字段（mode = nav 时必填）
 * @property {String} info 轮播图的数据，通过数组长度决定指示点个数
 * @property {Object} dotsStyles 指示点样式
 * @event {Function} clickItem 组件触发点击事件时触发，e={currentIndex}
 */

export default {
    name: "UniSwiperDot",
    props: {
        info: {
            type: Array,
            default() {
                return [];
            }
        },
        current: {
            type: Number,
            default: 0
        },
        dotsStyles: {
            type: Object,
            default() {
                return {};
            }
        },
        // 类型 ：default(默认) indexes long nav
        mode: {
            type: String,
            default: "default"
        },
        // 只在 nav 模式下生效，变量名称
        field: {
            type: String,
            default: ""
        }
    },
    emits: ["clickItem"],
    data() {
        return {
            dots: {
                width: 6,
                height: 6,
                bottom: 10,
                color: "#fff",
                backgroundColor: "rgba(0, 0, 0, .3)",
                border: "1px rgba(0, 0, 0, .3) solid",
                selectedBackgroundColor: "#333",
                selectedBorder: "1px rgba(0, 0, 0, .9) solid"
            }
        };
    },
    watch: {
        dotsStyles(newVal) {
            this.dots = Object.assign(this.dots, this.dotsStyles);
        },
        mode(newVal) {
            if (newVal === "indexes") {
                this.dots.width = 14;
                this.dots.height = 14;
            } else {
                this.dots.width = 6;
                this.dots.height = 6;
            }
        }
    },
    created() {
        if (this.mode === "indexes") {
            this.dots.width = 12;
            this.dots.height = 12;
        }
        this.dots = Object.assign(this.dots, this.dotsStyles);
    },
    methods: {
        clickItem(index) {
            this.$emit("clickItem", index);
        }
    }
};
</script>

<style lang="scss" scoped>
.uni-swiper__warp {
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex: 1;
    flex-direction: column;
    position: relative;
    overflow: hidden;
}

.uni-swiper__dots-box {
    position: absolute;
    bottom: 10px;
    left: 0;
    right: 0;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex: 1;
    flex-direction: row;
    justify-content: center;
    align-items: center;
}

.uni-swiper__dots-item {
    width: 8px;
    border-radius: 100px;
    margin-left: 6px;
    background-color: rgba(0, 0, 0, 0.4);
    /* #ifndef APP-NVUE */
    cursor: pointer;
    /* #endif */
    /* #ifdef H5 */
    // border-width: 5px 0;
    // border-style: solid;
    // border-color: transparent;
    // background-clip: padding-box;
    /* #endif */
    // transition: width 0.2s linear;  不要取消注释，不然会不能变色
}

.uni-swiper__dots-item:first-child {
    margin: 0;
}

.uni-swiper__dots-default {
    border-radius: 100px;
}

.uni-swiper__dots-long {
    border-radius: 50px;
}

.uni-swiper__dots-bar {
    border-radius: 50px;
}

.uni-swiper__dots-nav {
    bottom: 0px;
    // height: 26px;
    padding: 8px 0;
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    flex: 1;
    flex-direction: row;
    justify-content: flex-start;
    align-items: center;
    background-color: rgba(0, 0, 0, 0.2);
}

.uni-swiper__dots-nav-item {
    /* overflow: hidden;
    text-overflow: ellipsis;
    white-space: nowrap; */
    font-size: 14px;
    color: #fff;
    margin: 0 15px;
}

.uni-swiper__dots-indexes {
    /* #ifndef APP-NVUE */
    display: flex;
    /* #endif */
    // flex: 1;
    justify-content: center;
    align-items: center;
}

.uni-swiper__dots-indexes-text {
    color: #fff;
    font-size: 12px;
    line-height: 14px;
}
</style>
